ask your doctor if including advair could help improve your lung function. [ male announcer ] advair diskus fluticasone propionate and salmeterol inhalation powder. get your first prescription free and save on refills at advaircopd.com. >>> we're getting our first look right now at pictures of a partially exploded device. this could provide new clues for investigators in the boston marathon bombings. >> we'll talk about that this morning. also prayers. prayers for the family of this 8-year-old boy killed in the marathon terror attack. his mother and his younger sister suffering serious injuries. some 2,000 people turning out last night for a candlelight vigil. >>> and united we all stand. new york and boston, from a moment of silence to a moment of song. yankee fans reach across the rivalry to honor the marathon victims and the city of boston. such a lovely tribute. welcome back to this special edition of "early start." i'm john berman. >> i'm brooke baldwin, here we are live in boston yards from where those two explosions happened. we begin with that investigation and what we know a